Speed-boat hull



April 20, 1926. 1,581,881

C. R. SMITH SPEED BOAT HULL F d y 9. 1925 2 Sheets-Sheet 1 April 20 1926.

C. R. SMITH SPEED BOAT HULL Filed y 9, 1925 2 Sheets-Sheet 2 Patented Apr. 20, 1926.

- UNITED STATES PATENT orsics.

CLARENCE B. SMITH, or MIAMI, rronrnn.

SPEED-BOAT HULL.

Application filed May' a,

ticularly to speed boats.

The object of the invention is to so form this boat as to reduce the vacuum normally found at the stern of the speed boat when the latter is running fast to thereby increase the speed and enable the boat to be turned in a shorter curve than would otherwise be possible.

A further object is to so form or design the stern of the boat as to keep the boat from squatting in the wateror settling down when running at a high speed, and

further to give such form and shape to the hull of the boat that back pressure will be reduced to a minimum.

A still further object is to provideia boat wherein the chine extends rearwardly and downwardly to the stern, while the keel xtends rearwardly and upwardly to the stern of the boat.

My invention is illustrated in the accompanying drawings, wherein V Figure 1 is aside elevation of the hull of a boat constructed in accordance with my invention; a Figure 2 1s a top plan view thereof; Figure 3 1s a bottom plan View thereof;

Figure 4: is a diagrammatic section on the line 4-4 of Figure 1;

Figure 5 is a section on the'line 5-5 of Figure 1;

Figure 6 is a section on the line 66 of.

the spon'sons terminate at the rear end of Figure 1;

Figure Figure 1;

Figure 8 is a section on the line 8-8 of Figure 1;

Figure 9 is a section on the line 9-9 of Figure 1;

7 is a section on the line 77 of Figure 10 1s a diagram taken on the line 10-10 of Figure 1 showing the relation of the vertical axis of the hull to the bottom at the extreme stern.

Referring to these drawings, it will be seen that I have illustrated the hull of the- This invention relates to boats, and par- 1925. Serial No. 29,221.

of this hull that my invention resides. In the drawings, 10 designates the deck'ofthe boat. This deck is purely diagrammatically illustrated, but it will be seen that the deck is slightly. rounded upwardly and transversely. The chines 1.1, which may be said to define the sides of the boat from the bottom of the boat, extend downwardly and rearwa'rdly from the bow to the stern. The keel 12 of'the boat extends downwardly and .rearwardl from the bow and has its reatestv distance from the chines at the point a. The keel 12 then extends upwardly and rearwardly to the extreme stern of the boat where it. approximates or nearly intersects the line of the chines.

From the stern of the boat to a point about amidships,the bottom of the boat is nearly flat, as at 13, there being but a slight inclination dowmvardly and inwardly, butv from the point 6 onward to the how the bottom of the boat,ras seen in cross section, is approximately V-shaped and the two portions 14 of the bottoinfon each side of the keel may extend straight downwardly and transversely to thekeel or be concave or convex. From a point approximately midlength of the boat to the stern thereof the sides of the boat are formed to provide the sponsons 15. lhe side edges of these spon- "sons extend rearwardly with a very slight curve, while the hull of the boat above the.

sponsors extends rearwardly and toward the middle line of the boat, as at 16, so that the upper portion of the hull above the sponsons 15 has a streamline form. All that portion of the hull forward of the sponsons is slightly concavely curved vertically and the forward portions of the sponsons imerge gradually into the hull at the line of the chine 11. As shown, the rear of the hull is preferably pointed and the rear edges of boat is of the conventional V-type, as before in the water, while the shape ofthe stern.

of the boat rearward of the amidships section acts to reduce the vacuum at'the stern,

thus increasing the speed and enabling theboat to be turned in very short curves. The sides of the boat are formed with a streamline so that there is the least possible impediment to its forward movement in the water.

I claim 1. A boat ofzthe character described having a hull, the chines-0t which extend downwardly and rearwardly from the bowiofthe boat to the stei'lrtliereof andthe keeliof which extends upwardly and 'rearward l y from :the bow of the boat tothe stern thereof, the keel at the stern=nearly intersecting the plane of the: chines, the sternlportion' of the hull? above the plane of the chines being rearwardlytapered, the lower portion of the hull froma pointzapproxi- .inately amidships to the stern. being-i laterally extended to form twolaterally projecting sponsons on each side ofithe-st'ern, the lower faces of the-61301150118 intersecting the chines and heel 2. A boat hull having sides and'a bottom, the bottom being V shapedz and-the chines of the hull extending downwardly and rearwa-rdly from the 'bow' and the keel of the boat extending upwardly and rearwardly from the bow into-nearly the same plane as the chin'e at the stern of'th'e hull, the sides of the boat:beingverticallyv concave from the bow to arpoint approximately ainidships, the lower portion of the-sides 1 o-f'the boat extending upwardly andr'ear- 'wardly from the bow'to the stern, the bottom of the boat extending,transversely, downwardly and inwardly to the keel of the boat and the angle of said bottom being extremely obtuse atv the stern' of th e boat and gradually increasing in angi-ularity toward. the how 01" the boat, the-sidescof the boat fronrthe bow to a point about amid.- ships extending upwardly and outwardly and from a point approximately *amidships to the stern otthe boat extendingverticaliy upward, there being, sponsons fOlDJG(l:O11

each side of the stern of the boat, the lower faces of said'sponsons being flush with the chines-and the upper: faces of the sp'onsons extending upwardly and inwardly to the sides of the boat and the forward por- 'tions of saidspcnsons merginginto the sides of the boat; the "rear of the hull above said sponsons extending rearwardly' and. inwardly.

In testimony whereof I hereunto affixmy signature.

CLARENCE Rf SMITH. 

